Alloy



unrrnn sraarns raarnnr @FJBIGE.

WILLIAM J. REARDON, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR T0WESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OFPENNSYLVANIA.

ALLOY.

No Drawing.

To all whom it may concern:

Be it known that I, WILLIAM J. REARDON, a citizen of the United States,and a resident of Pittsburgh, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement in Alloys, ofwhich the following is a specification.

My invention relates to alloys, and it has particular reference toalloys in which extreme lightness is combined with great tensilestrength.

The object of my invention is to produce alloys of the kind designatedhaving improved properties that render them especially well suited tothe manufacture of castings. 7

Alloys composed of magnesium and aluminum are well known in the arts andare extremely useful in many situations where it is desirable to employa very light and strong metal. The magnesium increases the hardness ofaluminum without increasing its specific gravity.

Alloys of this class are extremely difficult to cast satisfactorily.Even when prepared with the greatest care, castings made from suchalloys are frequently filled with blow holes and black specks whichrender them useless, and the loss due to oxidation during the meltingprocess is very high.

I have discovered that the above-noted objections may be overcome byadding to the magnesiumaluminum alloys a small proportion of metallicvanadium, which acts as a deoxidizing agent increases the tensilestrength of the alloys, and makes possible the production of castings ofuniform excellence, free from blow holes and specks.

Only a very small amount of Vanadium is necessary, and the cost of myimproved alloys is therefore but little greater than the cost of theordinary aluminum-magnesium alloys.

Specification of Letters Patent.

My alloys may be compounded in a wide variety of proportions. Accordingto one formula which I have found highly successful, I prepare an alloyof aluminum and vanadium containing 20% of vanadium and 80% of aluminum.I then prepare an alloy of aluminum and magnesium containing 92 to 93%of aluminum and 7 to 8% of magnesium. Finally, I add one-fourth of oneper cent. of the aluminum-vanadium alloy to 99.75% of thealuminum-magnesium alloy. The final alloy, therefore, contains only .05of one per cent. of metallic vanadium. This alloy casts readily, and hasa tensile strength. of over 28,000 pounds.

It is to be understood that the example which I havegiven is'merelyillustrative, and that many variations may be made in the proportionsof'the ingredients and in the order in which they are combined withoutdeparting from the spirit of my invention, which is to be limited onlyby the scope of the appended claims.

I claim as my invention:

1- An alloy Suitable for casting without the formation of blow-holes andblack specks in the castings, and containing aluminum, magnesium andless than one per cent. of vanadium. I

2. An alloy comprising aluminum, magnesium and a relatively smallproportion o vanadium.

3. An alloy comprising aluminum, magnesium and less than one per cent.of vanadium.

In testimony whereof I have hereunto subscribed my name this 28th day ofFeb., 1914.

WILLIAM J. REARDON.

Witnesses:

C. E. DECKER, B. B. HINES.

Patented May 2%, 11919. Application filed March 18, 1914. Serial No.825,502..

